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x in (-oo:+oo)
2*y = (1/5)*x // - (1/5)*x
2*y-((1/5)*x) = 0
(-1/5)*x+2*y = 0
2*y-1/5*x = 0 // - 2*y
-1/5*x = -(2*y) // : -1/5
x = (-(2*y))/(-1/5)
x = 10*y
x = 10*y
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